ST2041
Enhanced power switch
Not recommended for new design
Features
■
■
■
■
■
■
■
■
■
■
■
90 m Ω high-side MOSFET switch
500 mA continuous current per channel
Thermal and short-circuit protection with overcurrent logic output
Operating range from 2.7 to 5.5 V
CMOS- and TTL-compatible enable inputs
2.5 ms typical rise time
Undervoltage lock out
10 µA maximum standby supply current
Ambient temperature range, 0 °C to 85 °C
2 kV ESD protection
Fault-blanking
Table 1.
Device summary
Order code
ST2041BDR
(1)
Package
SO-8
SO-8
Packaging
Tape and reel
1.
Not recommended for new design (refer to STMPS2141MTR). Contact ST sales office for availability.
Obsolete Product(s) - Obsolete Product(s)
November 2010 Doc ID 12592 Rev 3
This is information on a product still in production but not recommended for new designs.
1/13 www.st.com
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5
6
7
1
2
3
Contents
Contents
4
ST2041
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Schematic diagram and pin connections . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1
Fault-blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2
Overcurrent/overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3
Undervoltage lock out (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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2/13 Doc ID 12592 Rev 3
ST2041
1 Description
Description
The ST2041 power distribution switch is intended for applications where heavy capacitive loads and short-circuits are likely to be encountered. These devices incorporate 90 m
Ω
N-channel MOSFET high-side power switches for power-distribution. The switch is controlled by a logic enable input. Gate drive is provided by an internal charge pump designed to control the power-switch rise times and fall times to minimize current surges during switching. The charge pump requires no external components and allows operation from supplies as low as 2.7 V.
When the output load exceeds the current-limit threshold or a short is present, the device limits the output current to a safe level by switching into a constant-current mode, pulling the overcurrent logic output low. When continuous heavy overloads and short-circuits increase the power dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shuts off the switch to prevent damage. Recovery from a thermal shutdown is automatic once the device has cooled sufficiently. Internal circuitry ensures the switch remains off until valid input voltage is present.
Obsolete Product(s) - Obsolete Product(s)
Doc ID 12592 Rev 3 3/13
Schematic diagram and pin connections
2 Schematic diagram and pin connections
Figure 1.
Schematic diagram
ST2041
EN_N
Figure 2.
Pin connections (top view)
EN_N
Table 2.
Pin
Pin functions
Name Type Description
1 GND Ground
2
Obsolete Product(s) - Obsolete Product(s)
4
IN1
IN2
EN_N I
-
-
V
CC
input, 2.7-5.5 V
V
CC
input, 2.7-5.5 V
Enable (active low)
5 OC O Open drain output for fault indication
6
7
8
OUT3
OUT2
OUT1
-
-
-
Output
Output
Output
4/13 Doc ID 12592 Rev 3
ST2041 Functional descriptions
3.1 Fault-blanking
ST devices feature a 10 ms fault-blanking. Fault-blanking allows current-limit faults, including momentary short-circuit faults that occur when hot-swapping a capacitive load, and also ensures that no fault is issued during power-up. When a load transient causes the device to enter current limit, an internal counter starts. If the load fault persists beyond the 10 ms faultblanking timeout, the FAULT output asserts low. Load-transient faults less than 10 ms
(typical) will not cause a FAULT output assertion. Only current-limit faults are blanked. Die overtemperature faults and input voltage drops below the undervoltage lock out (UVLO) threshold will cause an immediate fault output.
3.3
In overcurrent or short-circuit condition, the switch limits the current at 500 mA.
If temperature of die goes above limit value, the switch turns OFF.
Undervoltage lock out (UVLO)
When input voltage drops below critical value, the power switch turns OFF to prevent improper operation due to low voltage.
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Doc ID 12592 Rev 3 5/13
Maximum rating ST2041
Stressing the device above the rating listed in the “Absolute maximum ratings” table may cause permanent damage to the device. These are stress ratings only, and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics™ SURE program and other relevant quality documents.
Table 3.
Symbol
V
I
V
O
V
IENX
I
O
ESD
T
J
T
STG
Absolute maximum ratings
Parameter
Input voltage range
Output voltage range
EN input voltage range
Continuous output current
ESD protection level
Junction operating temperature
Storage temperature
Value
-0.3-6.0
-0.3-(Vi+0.3)
-0.3-6.0
Internally limited
2
-40 to 125
-55 to 150
Unit
V
V
V kV
°C
°C
Recommended operating conditions
Table 4.
Symbol
V
I
V
O
I
O
Recommended operating conditions
Parameter
Input voltage
Output voltage
Continuous output current
Min
2.7
0
0
Typ
5.0
5.0
-
Max
5.5
5.5
500
Unit
V
V mA
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6/13 Doc ID 12592 Rev 3
ST2041 Electrical characteristics
Table 5.
Symbol
Electrical characteristics (T
J
= 25 °C, V
I
= 5.0 V)
Parameter Test conditions Min Typ Max Unit
R
DS(on)
T
T t t r f
ON
OFF
Static drain-source on-state resistance
Output rise time
Output fall time
Turn-on time
Turn-off time
(1)
(1)
(1)
(1)
V
I
= 3.3 V
-40 < T
J
< 125 °C
V
I
= 5.0 V
-40 < T
J
< 125 °C
V
I
= 3.3 V
T
J
= 25 °C
V
I
= 5.0 V
T
J
= 25°C
V
I
= 5.5 V
R
L
= 10 Ω
C
L
= 1 μ F
V
I
= 2.7 V
R
L
= 10 Ω
C
L
= 1 μ F
V
I
= 5.5 V
R
L
= 10 Ω
C
L
= 1 μ F
V
I
= 2.7 V
R
L
= 10 Ω
C
L
= 1 μ F
RL = 10
Ω
CL = 100
μ
F
RL = 10
Ω
CL = 100
μ
F
1.
Not tested in production, specified by design.
100 145
90
90
80
2.5
3
0.3
0.2
135
130
110
20
40 m Ω ms ms ms ms ms ms
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Doc ID 12592 Rev 3 7/13
Electrical characteristics ST2041
Table 6.
Symbol
I
OS
Current limit characteristics (V
I
= 5.5 V, I
O
= rated current, T unless otherwise specified)
J
= 25 °C,
Parameter Test conditions Min Typ Max Unit
Short-circuit output current
V
I
= 5 V
OUT connected to GND, device enabled into shortcircuit
0.7
1.0
1.3
A
Table 7.
Symbol
I
OFF
I
ON
I leakage
Supply current characteristics (V
I unless otherwise specified)
= 5.5 V, I
O
= rated current, T
J
= 25 °C,
Parameter Test conditions Min Typ
Switch turned OFF
Switch turned ON
Output leakage current
No load
No load; -40 < T
J
< 125 °C
No load
No load; -40 < T
J
< 125 °C
Output grounded, switch is
OFF
Output grounded, switch is
OFF; -40 < T
J
< 125 °C
1.0
70
Max Unit
5.0
10
90
100
μ
A
μ
A
μ
A
μ
A
10
20
μ
A
μ
A
Table 8.
Symbol
Thermal characteristics (V
I unless otherwise specified)
= 5.5 V, I
O
= rated current, T
J
= 25 °C,
Parameter Test conditions Min Typ Max Unit
T1
T2
Hyst
Thermal shutdown threshold
Recovery from thermal shutdown
Hysteresis
135
125
10
°C
°C
°C
Table 9.
UVLO characteristics (V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Parameter Test conditions Min Typ Max Unit Symbol
V
UVLO
Hyst
Undervoltage lockout threshold
Hysteresis
2.0
100
2.5
V mV
Table 10.
OC pin characteristics (V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified) Obsolete Product(s) - Obsolete Product(s)
Symbol Parameter Test conditions Min Typ Max Unit
OC blanking
OCx assertion and de-assertion
(1)
V
O
I
OFF
Output low voltage
OFF current
1.
Not tested in production, specified by design.
4 8 15
0.4
1.0
mS
V
μ
A
8/13 Doc ID 12592 Rev 3
ST2041 Electrical characteristics
Table 11.
EN_N pin characteristics (V
I unless otherwise specified)
= 5.5 V, I
O
= rated current, T
J
= 25 °C,
Symbol Parameter Test conditions Min Typ Max Unit
V
IH
V
IL
I
I
High level input voltage
Low level input voltage
Input current
V
I
= 2.7 to 5.5 V
V
I
= 4.5 to 5.5 V
V
I
= 2.7 to 4.5 V
V
IENX
= 0 V or V
I
2.0
-0.5
0.8
0.4
0.5
V
V
V
μ
A
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Doc ID 12592 Rev 3 9/13
Package mechanical data ST2041
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
® specifications, grade definitions and product status are available at: www.st.com
.
ECOPACK
®
is an ST trademark.
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10/13 Doc ID 12592 Rev 3
ST2041
Figure 3.
SO-8 package outline
Package mechanical data
Table 12.
SO-8 mechanical data
Millimeters inches
Symbol
Min Typ Max Min Typ Max
A 1.35
A1 0.10
A2 1.10
B 0.33
C 0.19
E 3.80 e 1.27
H 5.80 h 0.25
L 0.40
0.069
0.010
0.065
0.020
0.010
0.197
0.157
0.050
0.244
0.020
0.050 ddd 0.10 0.004
Doc ID 12592 Rev 3 11/13
Revision history ST2041
5
Table 13.
Document revision history
Date Revision
05-May-2006
20-Feb-2008
24-Nov-2010
1
2
3
Changes
Initial release.
Document restructured and converted to new ST template, watermark removed.
Document reformatted, added “Not Recommended for New
Design” and
Note 1 below Table 1
, updated ECOPACK
®
text in
Section 6 , corrected typo in
Features ,
Section 1
,
Table 2 ,
Section 3 ,
Section 4 , Table 3 ,
Table 5 to
Table 11 .
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12/13 Doc ID 12592 Rev 3
ST2041
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Doc ID 12592 Rev 3 13/13
